Specifying multiple simultaneous output formats in knitr

39
votes

I would like to be able to specify multiple output formats at the same time, for instance html_document and a pdf_document. I know that this can be done very simply with something like

---
  output: [html_document, pdf_document]
---

I might have some of that syntax off, but I can not seem to find the documentation anywhere. I have recently discovered knitr-bootstrap and love it. It is what I have been looking for to be able to dynamically hide my code and output blocks.

Unfortunately, by default, the YAML block for the knitr-bootstrap invocation is quite complex and I do not know how to specify multiple outputs for this.

I have looked at the YAML spec and tried a few different things but I am at a loss. Below is my current YAML frontmatter.

---
title: "Beta Regression Comparison"
opset: bootstrap
output:
  knitrBootstrap::bootstrap_document:
    title: "Beta Regression Comparison"
    theme: Simplex
    highlight: Solarized - Light
    theme.chooser: FALSE
    highlight.chooser: FALSE
    menu: FALSE
  pdf_document
---
2
rknitr

2 Answers

41
votes

The solution is to change pdf_document to pdf_document: default. I can't unfortunately find a reference for this syntax in the official documentation. If however you open a RMarkdown document in a recent version of RStudio, click Knit HTML and then Knit PDF, it uses this : default syntax.

The syntax is:

---
output:
  html_document:
    keep_md: yes
  pdf_document: default
---
1
votes

In my case, I tried to knit multiple output-documents using bookdown and found this post which allowed me to get the desired result.

You can write the output-definition in your YAML header as follows:

---
output:
  bookdown::pdf_document2:
    template: "path-to-my-template"
  bookdown::word_document2:
    default
knit: (function(inputFile, encoding){
  rmarkdown::render(inputFile, encoding = encoding,
  output_dir = "my-output-path", output_format = "all") })
---